#ifndef __BASE_BITFIELD_HH__
#define __BASE_BITFIELD_HH__
-#include <inttypes.h>
+#include "base/types.hh"
/**
* Generate a 64-bit mask of 'nbits' 1s, right justified.
return (val >> last) & mask(nbits);
}
+/**
+ * Extract the bit from this position from 'val' and right justify it.
+ */
+template <class T>
+inline
+T
+bits(T val, int bit)
+{
+ return bits(val, bit, bit);
+}
+
/**
* Mask off the given bits in place like bits() but without shifting.
* msb = 63, lsb = 0
T
insertBits(T val, int first, int last, B bit_val)
{
+ T t_bit_val = bit_val;
T bmask = mask(first - last + 1) << last;
- return ((bit_val << last) & bmask) | (val & ~bmask);
+ return ((t_bit_val << last) & bmask) | (val & ~bmask);
+}
+
+/**
+ * Overloaded for access to only one bit in value
+ */
+template <class T, class B>
+inline
+T
+insertBits(T val, int bit, B bit_val)
+{
+ return insertBits(val, bit, bit, bit_val);
}
/**
val = insertBits(val, first, last, bit_val);
}
+/** Overloaded function to allow to access only 1 bit*/
+template <class T, class B>
+inline
+void
+replaceBits(T& val, int bit, B bit_val)
+{
+ val = insertBits(val, bit, bit, bit_val);
+}
/**
* Returns the bit position of the MSB that is set in the input
*/
return msb;
}
-namespace BitfieldBackend
-{
- template<class Data>
- class BitfieldBase
- {
- protected:
- Data __data;
-
- inline uint64_t
- getBits(int first, int last)
- {
- return bits(__data, first, last);
- }
-
- inline void
- setBits(int first, int last, uint64_t val)
- {
- replaceBits(__data, first, last, val);
- }
- };
-
- template<class Type, class Base>
- class _BitfieldRO : public Base
- {
- public:
- operator const Type ()
- {
- return *((Base *)this);
- }
- };
-
- template<class Type, class Base>
- class _BitfieldWO : public Base
- {
- public:
- const Type operator = (const Type & _data)
- {
- *((Base *)this) = _data;
- return _data;
- }
- };
-
- template<class Data, int first, int last=first>
- class _Bitfield : public BitfieldBase<Data>
- {
- public:
- operator const Data ()
- {
- return this->getBits(first, last);
- }
-
- const Data
- operator = (const Data & _data)
- {
- this->setBits(first, last, _data);
- return _data;
- }
- };
-
- template <class Type, class Base>
- class BitUnionOperators : public Base
- {
- public:
- operator const Type ()
- {
- return Base::__data;
- }
-
- const Type
- operator = (const Type & _data)
- {
- Base::__data = _data;
- }
-
- bool
- operator < (const Base & base)
- {
- return Base::__data < base.__data;
- }
-
- bool
- operator == (const Base & base)
- {
- return Base::__data == base.__data;
- }
- };
+/**
+ * Returns the bit position of the LSB that is set in the input
+ */
+inline int
+findLsbSet(uint64_t val) {
+ int lsb = 0;
+ if (!val)
+ return sizeof(val) * 8;
+ if (!bits(val, 31,0)) { lsb += 32; val >>= 32; }
+ if (!bits(val, 15,0)) { lsb += 16; val >>= 16; }
+ if (!bits(val, 7,0)) { lsb += 8; val >>= 8; }
+ if (!bits(val, 3,0)) { lsb += 4; val >>= 4; }
+ if (!bits(val, 1,0)) { lsb += 2; val >>= 2; }
+ if (!bits(val, 0,0)) { lsb += 1; }
+ return lsb;
}
-#define __BitUnion(type, name) \
- namespace BitfieldUnderlyingClasses \
- { \
- class name; \
- } \
- class BitfieldUnderlyingClasses::name { \
- public: \
- typedef type __DataType; \
- union { \
- type __data;\
-
-#define EndBitUnion(name) \
- }; \
- }; \
- typedef BitfieldBackend::BitUnionOperators< \
- BitfieldUnderlyingClasses::name::__DataType, \
- BitfieldUnderlyingClasses::name> name;
-
-#define __SubBitUnion(type, name) \
- union { \
- type __data; \
- inline operator const __DataType () \
- { return __data; } \
- \
- inline const __DataType operator = (const __DataType & _data) \
- { __data = _data; }
-
-#define EndSubBitUnion(name) } name;
-
-//This is so we can send in parameters with commas
-#define wrap(guts) guts
-
-//Read only bitfields
-#define __BitfieldRO(base) \
- BitfieldBackend::_BitfieldRO<__DataType, base>
-#define __SubBitUnionRO(name, base) \
- __SubBitUnion(wrap(_BitfieldRO<__DataType, base>), name)
-
-//Write only bitfields
-#define __BitfieldWO(base) \
- BitfieldBackend::_BitfieldWO<__DataType, base>
-#define __SubBitUnionWO(name, base) \
- __SubBitUnion(wrap(_BitfieldWO<__DataType, base>), name)
-
-//Regular bitfields
-#define Bitfield(first, last) \
- BitfieldBackend::_Bitfield<__DataType, first, last>
-#define SubBitUnion(name, first, last) \
- __SubBitUnion(Bitfield(first, last), name)
-#define BitfieldRO(first, last) __BitfieldRO(Bitfield(first, last))
-#define SubBitUnionRO(name, first, last) \
- __SubBitUnionRO(Bitfield(first, last), name)
-#define BitfieldWO(first, last) __BitfieldWO(Bitfield(first, last))
-#define SubBitUnionWO(name, first, last) \
- __SubBitUnionWO(Bitfield(first, last), name)
-
-#define BitUnion(type, name) __BitUnion(type, name)
-
-#define BitUnion64(name) __BitUnion(uint64_t, name)
-#define BitUnion32(name) __BitUnion(uint32_t, name)
-#define BitUnion16(name) __BitUnion(uint16_t, name)
-#define BitUnion8(name) __BitUnion(uint8_t, name)
-
#endif // __BASE_BITFIELD_HH__
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